* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  display: flex;
  height: 100%;
  margin: 0;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #4ca1af, #9db1c5);
  padding: 20px;
  font-family: 'Arial', sans-serif;
  transition: all 0.3 ease;
}

.container {
  display: flex;
  flex-direction: column;
  align-items: center;
  backdrop-filter: blur(5.5px);
  -webkit-backdrop-filter: blur(5.5px);
  background: rgba(255, 255, 255, 0.65);
  padding: 2rem;
  border-radius: 20px;
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
  width: 90%;
  max-width: 800px;
  transition: all 0.3s ease;
}

.camp {
  background: rgba(255, 255, 255, 0.65);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
  border: none;
  border-radius: 8px;
  width: 100%;
  height: 30em;
  min-height: 200px;
  resize: none;
  padding: 1rem;
  font-size: 1rem;
  font-family: 'Arial', sans-serif;
  transition: all 0.3s ease;
}

.result {
  display: flex;
  justify-content: center;
  margin-top: 1rem;
  font-size: 1.2rem;
  font-weight: bold;
  color: #333;
  transition: opacity 0.3s ease;
}

.clean-btn {
  margin-top: 1rem;
  padding: 0.5rem 1.5rem;
  font-size: 1rem;
  background-color: #4ca1af;
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.clean-btn:hover {
  background-color: #357f81;
}

.theme-btn {
  margin-top: 1rem;
  padding: 0.5rem 1rem;
  font-size: 1.5rem;
  background: transparent;
  color: #333;
  border: 2px solid #333;
  border-radius: 8px;
  cursor: pointer;
  transition: color 0.3s, border-color 0.3s;
}

.theme-btn:hover, body.dark-theme .theme-btn:hover {
  color: #4ca1af;
  border-color: #4ca1af;
}

body.dark-theme {
  background: linear-gradient(135deg, #39565a, #1d344b);
  color: #fff;
}

body.dark-theme .container {
  background: rgba(0, 0, 0, 0.65);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.5);
}

body.dark-theme .camp {
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
}

body.dark-theme .result {
  color: #ddd;
}

body.dark-theme .theme-btn {
  color: #aaa;
  border: 2px solid #aaa;
}

@media (max-width: 600px) {
  .container {
    width: 95%;
    padding: 1rem;
    margin: 0 auto;
  }

  .camp {
    width: 100%;
    min-height: 12em;
    font-size: 1rem;
    padding: 0.8rem;
    resize: none;
  }

  .result {
    font-size: 1rem;
    margin-top: 0.8rem;
    text-align: center;
  }

  button {
    width: 100%;
    padding: 0.9rem;
    font-size: 1rem;
    margin-top: 0.5rem;
  }

  * {
    box-sizing: border-box;
  }
}